Take away the ethnic/pregnancy angles, and we've seen this premise countless times -- all the way back to the spate of post-World War II romances about returning veterans and the mates they married in a blink.
I absolutely adore this movie. I've watched it multiple times and every time I end up in tear. I originally rented it from a redbox or blockbuster express stand because I never saw it in theaters. I didn't immediately go out to buy it just because I didn't want to spend so much money on just one dvd, no matter how much I loved the movie; but I was glad when the price came down on it and I went and picked up and have been watching it ever since
Semi-Tough pokes fun in rambling fashion, but it is vulgar in intelligent ways and almost always amusing in its perceptions of befuddled people who are perfectly healthy but often convinced they're not.